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CV curves of the bare gold electrode, modifications of the gold electrode: gold/chitosan, gold/chitosan/origami-ssDNA, and gold/chitosan/origami-ssDNA/miRNA. CV curves were performed in 5.0 mM [Fe(CN)6]3–/4– containing 0.1 M KCl with a scan range from −0.2 to +0.6 V.
